CN202026240U - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN202026240U CN202026240U CN2010206959688U CN201020695968U CN202026240U CN 202026240 U CN202026240 U CN 202026240U CN 2010206959688 U CN2010206959688 U CN 2010206959688U CN 201020695968 U CN201020695968 U CN 201020695968U CN 202026240 U CN202026240 U CN 202026240U
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Abstract
The utility model discloses a switching power supply. The switching power supply comprises a power supply conversion integrated circuit, a direct current power supply, a follow current circuit, a first energy storage unit and a second energy storage unit, wherein the power supply conversion integrated circuit is an integrated chip MC34063, the follow current circuit comprises a diode 1N4148 and a resistor R3 which are connected in series, the positive pole of the diode 1N4148 is connected with a pin 1 of the integrated chip MC34063, the negative pole of the diode 1N4148 is connected with one end of the resistor R3, and the other end of the resistor R3 is connected with a pin 5 of the integrated chip MC34063. In the switching power supply, a common diode 1N4148 used has a higher reverse breakdown voltage, and under the situations of lower requirements, namely a current is no more than 50milliampere, the voltage is no more than 100V and the oscillating frequency is no more than 1MHz, the functions of a Schottky diode can be completely realized while the cost is lower.
Description
Technical field
The utility model relates to a kind of power supply, relates in particular to a kind of Switching Power Supply.
Background technology
Switching Power Supply basic topology commonly used has 14 kinds approximately: buck switching-type regulator topology, boos t switch adjuster topology, reversed polarity switch adjuster topology, push-pull topology, forward converter topology, double-end normal shock converter topology, staggered forward converter topology, half-bridge converter topology, full-bridge converter topology, anti exciting converter, current-mode topological sum current feed topology, SCR shake humorous topology, CUK converter topology.Every kind of topology all has characteristics and the applicable situation of himself.
The fly-wheel diode of device for power switching, transformer secondary output boost with the 600V diode etc. with the high speed diode of 600V～1.2kV and PFC in the high-frequency rectification diode more than the 100V, RCD buffer circuits in Switching Power Supply (SMPS) and power factor correction (PFC) circuit, have only high diode such as the switching frequency that uses Schottky diode.
The Schottky diode that uses in the Switching Power Supply has advantages such as the high and forward voltage drop of switching frequency is low, but its reverse breakdown voltage is lower, scarcely is higher than 60V, the highest only about 100V, and also cost has consequently limited its range of application than the general-purpose diode height.
The utility model content
The technical problems to be solved in the utility model is that the Schottky diode reverse breakdown voltage in the Switching Power Supply is lower, and the defective that cost is higher provides a kind of Switching Power Supply of using other diodes to substitute Schottky diode.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of Switching Power Supply is provided, comprise the power conversion integrated circuit, the DC power supply that is connected with described power conversion integrated circuit, also comprise the freewheeling circuit that is connected with described power conversion integrated circuit, first energy-storage units that is connected with described freewheeling circuit, and second energy-storage units that is connected respectively with described freewheeling circuit and described power conversion integrated circuit, described power conversion integrated circuit is the integrated chip of MC34063, described freewheeling circuit comprises diode in series 1N4148 and resistance R 3, the positive pole of diode 1N4148 is connected with the pin 1 of integrated chip MC34063, negative pole is connected with an end of resistance R 3, and the other end of described resistance R 3 is connected with the pin 5 of integrated chip MC34063.
In the Switching Power Supply described in the utility model, described first energy-storage units is a capacitor C 12, and load R5 is in parallel with described capacitor C 12, is connected with ground with the negative pole of diode 1N4148 respectively after its parallel connection; The negative pole of diode 1N4148 is a voltage output end.
In the Switching Power Supply described in the utility model, described second energy-storage units is to be connected the pin 1 of integrated chip MC34063 and the inductance L 11 between the pin 7, be connected with current-limiting resistance R1 between the pin 7 of integrated chip MC34063 and the pin 8, connect sample resistance R2 between the pin 6 of integrated chip MC34063 and the pin 7, connect divider resistance R4 between the pin 5 of integrated chip MC34063 and the ground.
In the Switching Power Supply described in the utility model, also comprise and regulate integrated chip MC34063 pin 3 operating frequency, that be connected integrated chip MC34063 and the capacitor C 11 between the ground.
In the Switching Power Supply described in the utility model, the pin 2 of integrated chip MC34063 and pin 4 ground connection.
The utility model also provides a kind of CD writers, comprise power module and connected burning module, described power module comprises internal electric source, described internal electric source comprises USB power supply and connected booster circuit, and described booster circuit comprises integrated chip MC34063, the anodal first fly-wheel diode 1N4148 that is connected with the pin 1 of described integrated chip MC34063.
In the CD writers described in the utility model, described booster circuit also comprises first adjustable resistance that is connected with the pin 5 of the negative pole of the described first fly-wheel diode 1N4148 and described integrated chip MC34063.
In the CD writers described in the utility model, described power module also comprises external power source, first reduction voltage circuit that is connected with described external power source and second reduction voltage circuit, single-pole double-throw switch (SPDT), the king pile of described single-pole double-throw switch (SPDT) is connected with the booster circuit of described internal electric source, and two son stakes of described single-pole double-throw switch (SPDT) are connected with described USB power supply with described second reduction voltage circuit respectively.
In the CD writers described in the utility model, described external power source comprises the high-voltage DC power supply and second fly-wheel diode, the positive pole of wherein said second fly-wheel diode is connected with described high-voltage DC power supply, and the negative pole of described second fly-wheel diode is connected with described first reduction voltage circuit; Described first reduction voltage circuit connects and comprises that first linear voltage regulator that is connected with the negative pole of described second fly-wheel diode, described second reduction voltage circuit comprise a son second linear voltage regulator that is connected with described single-pole double-throw switch (SPDT).
In the CD writers described in the utility model, described first reduction voltage circuit also comprises second adjustable resistance that is connected with described first linear voltage regulator.
Application the utlity model has following beneficial effect: use common diode 1N4148 in Switching Power Supply, its reverse breakdown voltage is higher, and requiring under the lower occasion, be electric current be no more than 50 milliamperes, voltage be no more than 100V, when frequency of oscillation is no more than 1 megahertz, can realize the function of Schottky diode fully, but its cost is lower again.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit diagram of the utility model preferred embodiment Switching Power Supply;
Fig. 2 is the internal circuit diagram of integrated chip MC34063 in the utility model preferred embodiment Switching Power Supply;
Fig. 3 is the output voltage simulation waveform when exporting the load that connects 500 Europe resistance in the utility model preferred embodiment Switching Power Supply;
Fig. 4 is the circuit diagram of booster circuit in the utility model preferred embodiment OTP CD writers;
Fig. 5 is the circuit diagram of the power unit of the utility model preferred embodiment OTP CD writers.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Utilize Switching Power Supply to realize that direct voltage with 5V boosts in preferred embodiment of the present utility model and be the voltage about 12V, as shown in Figure 1, comprise the power conversion integrated circuit, this power conversion integrated circuit can directly use the integrated chip of model as MC34063, as shown in Figure 2, the pin 1 (csw) of integrated chip MC34063 is the collector terminal of switch transistor T 1; Pin 2 (esw) is switch transistor T 1 an emitter exit; Pin 3 (ct) is the terminals of timing capacitor ct, and control capacittance ct can make the operating frequency of MC34063 change in the 100-100kHz scope; Pin 4 (comm) is power supply ground; Pin 5 (fb) is the voltage comparator inverting input, also is simultaneously output voltage sampling end; Should external two precision during use be not less than 1% precision resistance; Pin 6 (vcc) is a power end; Pin 7 (ipk) is load peak electric current (Ipk) sampling end; When voltage surpasses 300mV between the pin 6 and 7, chip will start inner overcurrent protection function; Pin 8 (cdr) is the collector terminal of driving tube T2.Switching Power Supply comprises that also with the power conversion integrated circuit be the DC power supply that pin 6 power ends of MC34063 are connected, and adopts the DC power supply V1 of 5V in the utility model preferred embodiment; Also comprise the freewheeling circuit that is connected with the power conversion integrated circuit, freewheeling circuit comprises that diode D model is the resistance R 3 of 1N4148 and series connection with it, be connected between the pin 1 and pin 5 of integrated chip MC34063 after its series connection, wherein the positive pole of diode D is connected with the pin 1 of integrated chip MC34063, the negative pole of diode D is connected with resistance R 3, the negative pole of diode D is voltage output end, and the other end of resistance R 3 is connected with the pin 5 of integrated chip MC34063.In the preferred embodiment of the present invention, the resistance of resistance R 3 is 57 kilo-ohms, Switching Power Supply also comprises first energy-storage units that is connected with freewheeling circuit, be capacitor C 12, its two ends are connected with ground with the negative pole of diode D, capacitor C 12 two ends shunt load electric capacity R5, the capacitance of capacitor C 12 is 100 microfarads, the resistance of R5 is 500 Europe, as shown in Figure 3, be the simulation waveform of output voltage, output voltage is 12.75V, the voltage rise time is 6.002 milliseconds, and this simulation waveform has illustrated that substituting Schottky diode with general-purpose diode 1N4148 also can make the circuit steady operation.Second energy-storage units is to be connected the pin 1 of integrated chip MC34063 and the inductance L 11 between the pin 7, and 220 microhenrys of inductance L 11 are connected with current-limiting resistance R1 between the pin 7 of integrated chip MC 34063 and the pin 8, and the resistance of R1 is 330 Europe; Connect capacitor C 11 between the pin 3 of integrated chip MC34063 and the ground, be used to regulate integrated chip MC34063 operating frequency, the value of capacitor C 11 is 220 pico farads; Connect sample resistance R2 between the pin 6 of integrated chip MC34063 and the pin 7, its resistance is 1 Europe, the pin 2 of integrated chip MC34063 and pin 4 ground connection; Connect divider resistance R4 between the pin 5 of integrated chip MC34063 and the ground, resistance is 6.2K.
In the utility model preferred embodiment Switching Power Supply, when 1 conducting of switch transistor T in the chip, the DC power supply V1 of 5V is through sample resistance Rsc, inductance L 11, and inductance L 11 begins stored energys at this moment, and provides energy by C12 to load R5.When T1 disconnected, power supply and inductance provided energy for simultaneously load R5 and capacitor C 12.Inductance L 11 is during releasing energy, because the electromotive force polarity at its two ends is identical with electric power polarity, be equivalent to two power supply series connection, thereby the voltage that obtains on the load R5 is higher than the voltage of power supply V1.The frequency of switch transistor T 1 conducting and shutoff is called the operating frequency of chip.As long as the time constant of the relative load R5 of this frequency is enough high, just can obtain continuous direct voltage on the load R5, be 12V probably in the present embodiment.
The utility model preferred embodiment also provides and has utilized Switching Power Supply to boost to the USB power supply to obtain OTP CD writers (OTP:Opposite Track Path backlight path) than High Level DC Voltage, and its burning low pressure that needs is 5V, and the burning high pressure is 13V,
The utility model preferred embodiment OTP CD writers comprises power module and connected burning module, as shown in Figure 5, power module comprises internal electric source, internal electric source comprises USB power supply 101 and connected booster circuit 102 again, generally can be connected during the work of OTP CD writers, just the USB power supply that connects is considered as its internal electric source here with computer USB interface.As shown in Figure 4, sustained diode 2 models that booster circuit 102 comprises integrated chip MC34063, be connected with integrated chip MC34063 are 1N4148, utilize booster circuit 102 that the USB power supply of 5V is boosted to 13V, for the OTP CD writers provides working voltage.Need not external other power supplys like this, just can allow OTP CD writers operate as normal.
As shown in Figure 4, in the booster circuit 102, the pin 2 and 4 of integrated chip MC34063 is ground connection all, pin 6 connects USB power supply 101, connecting inductance between pin 5 and the pin 7 is 220 microhenrys, and wherein the positive pole of diode D2 is connected with the pin 1 of integrated chip MC34063, is in series with resistance R 46, R57 between the pin 5 of the negative pole of diode D2 and integrated chip MC34063, the resistance of resistance R 46 is 47 kilo-ohms, and the resistance of resistance R 57 is 10 kilo-ohms.As shown in Figure 4, be connected with current-limiting resistance R45 between the pin 7 of integrated chip MC34063 and the pin 8, resistance is 330 Europe, and a current-limiting resistance R44 is also arranged between pin 6 and the pin 7, and resistance is 1 Europe.The electric capacity 16 that also comprises the adjusting working frequency of chip that is connected with pin 3 in the booster circuit 102 is 220 pico farads.Comprise also in the booster circuit 102 that with the negative pole of diode D2 be the storage capacitor that voltage output end is connected, be formed in parallel by polar capacitor C9 and capacitor C 20, C9 is 10 microfarads, and C20 is 0.1 microfarad, also being connected with storage capacitor C15 between the pin 6 of integrated chip MC34063 and the ground, is 0.1 microfarad.
In the utility model preferred embodiment OTP CD writers, further, also be connected with the first semifixed resistor R50 between the negative pole of diode D2 and the pin 5, resistance is 100 kilo-ohms, is used for the voltage of the voltage output end of the negative pole of diode D2 is finely tuned.
In the utility model preferred embodiment OTP CD writers, as shown in Figure 5, power module also comprises external power source 201, first reduction voltage circuit 202 that is connected with external power source and second reduction voltage circuit 203, external power source is the direct voltage of 18V, first reduction voltage circuit 202 is used for external power source 18V is reduced to about the working voltage 13V of OTP CD writers, to reduce to about 5V through the voltage of first reduction voltage circuit 202 by second reduction voltage circuit 203 again, thereby the working voltage of OTP CD writers will be provided by external power source.
Power module also comprises single-pole double-throw switch (SPDT) S2, and the king pile 2 of single-pole double-throw switch (SPDT) S2 is connected with the booster circuit 102 of internal electric source, and two of single-pole double-throw switch (SPDT) S2 stakes 1 are connected with USB power supply 101 with second reduction voltage circuit 203 respectively with 3.The selection that can realize external power source and internal electric source by single-pole double-throw switch (SPDT) S2 is switched, and when a power supply breaks down therein, can not influence the operate as normal of OTP CD writers.When single-pole double-throw switch (SPDT) S2 connects USB power supply 101, promptly select for use internal electric source that the operating voltage of CD writers burning module is provided by USB, when single-pole double-throw switch (SPDT) S2 connected second reduction voltage circuit 203, promptly the external power source 201 by 18V came to provide operating voltage for the burning module of CD writers.
Further, as shown in Figure 5, external power source 201 comprises that also being used to protect second sustained diode, 1 model of external power source is 1N4007, and wherein the positive pole of second sustained diode 1 is connected with high-voltage DC power supply, and the negative pole of second sustained diode 1 is connected with first reduction voltage circuit 202; Can also second sustained diode 1 and first reduction voltage circuit 202 between connect a logical and disconnected single-pole double-throw switch (SPDT) S1 who is used to control external dc power.Adopting the first linear voltage regulator U2 model at first reduction voltage circuit 202 is LM317BT, its pin 2 is a voltage output end, output voltage is about 13V, the negative pole of second sustained diode 1 is connected with the pin 3 (input) of the first linear voltage regulator LM317BT, the pin 3 and 2 of the first linear voltage regulator LM317BT, and also be connected with divider resistance between pin 1 and 2, between pin 3 and 2, also be connected with the storage capacitor of ground connection in parallel, comprise a polar capacitor 10 microfarads and common electric capacity 0.1 microfarad, between this storage capacitor and the first linear voltage regulator LM317BT pin 1, also be connected with the second adjustable resistance R32, regulate the output voltage values that this resistance is the fine-tuning first reduction voltage circuit pin 2; Comprise that at second reduction voltage circuit second linear voltage regulator U3 model also is LM317BT, its pin 2 is connected with the son stake 3 of single-pole double-throw switch (SPDT) S2.Also be connected with the storage capacitor of ground connection in parallel between the pin 2 of the first linear voltage regulator U2 and the pin 3 of the second linear voltage regulator U3, comprise a polar capacitor 10 microfarads and common electric capacity 0.1 microfarad.As shown in Figure 5, also be connected with storage capacitor in parallel between the king pile of single-pole double-throw switch (SPDT) S2 and the ground, comprise a polar capacitor 10 microfarads and common electric capacity 0.1 microfarad.
The utility model Switching Power Supply and CD writers have all adopted common diode 1N4148 to substitute Schottky diode, and requiring under the lower occasion, be electric current be no more than 50 milliamperes, voltage be no more than 100V, when frequency of oscillation is no more than 1 megahertz, can realize the function of Schottky diode equally, and improved reverse breakdown voltage, can reduce cost simultaneously.Adopt booster circuit to realize boosting of inner USB power supply in addition in the CD writers, select external power source and internal electric source with single-pole double-throw switch (SPDT) simultaneously, the user can select used power supply as required, when a power supply breaks down therein, can substitute with another power supply, guarantee the operate as normal of CD writers.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (5)
1. Switching Power Supply, comprise the power conversion integrated circuit, the DC power supply that is connected with described power conversion integrated circuit, also comprise the freewheeling circuit that is connected with described power conversion integrated circuit, first energy-storage units that is connected with described freewheeling circuit, and second energy-storage units that is connected respectively with described freewheeling circuit and described power conversion integrated circuit, it is characterized in that, described power conversion integrated circuit is the integrated chip of MC34063, described freewheeling circuit comprises diode in series 1N4148 and resistance R 3, the positive pole of diode 1N4148 is connected with the pin 1 of integrated chip MC34063, negative pole is connected with an end of resistance R 3, and the other end of described resistance R 3 is connected with the pin 5 of integrated chip MC34063.
2. Switching Power Supply according to claim 1 is characterized in that, described first energy-storage units is a capacitor C 12, and load R5 is in parallel with described capacitor C 12, is connected with ground with the negative pole of diode 1N4148 respectively after its parallel connection; The negative pole of diode 1N4148 is a voltage output end.
3. Switching Power Supply according to claim 2, it is characterized in that, described second energy-storage units is to be connected the pin 1 of integrated chip MC34063 and the inductance L 11 between the pin 7, be connected with current-limiting resistance R1 between the pin 7 of integrated chip MC34063 and the pin 8, connect sample resistance R2 between the pin 6 of integrated chip MC34063 and the pin 7, connect divider resistance R4 between the pin 5 of integrated chip MC34063 and the ground.
4. Switching Power Supply according to claim 3 is characterized in that, also comprises regulating integrated chip MC34063 pin 3 operating frequency, that be connected integrated chip MC34063 and the capacitor C 11 between the ground.
5. Switching Power Supply according to claim 4 is characterized in that, the pin 2 of integrated chip MC34063 and pin 4 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206959688U CN202026240U (en) | 2010-12-31 | 2010-12-31 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206959688U CN202026240U (en) | 2010-12-31 | 2010-12-31 | Switching power supply |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202662130U Division CN202205464U (en) | 2010-12-31 | 2010-12-31 | Recorder |
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| Publication Number | Publication Date |
|---|---|
| CN202026240U true CN202026240U (en) | 2011-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206959688U Expired - Lifetime CN202026240U (en) | 2010-12-31 | 2010-12-31 | Switching power supply |
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| Country | Link |
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| CN (1) | CN202026240U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109698542A (en) * | 2019-01-11 | 2019-04-30 | 深圳市南瑞华腾新能源有限公司 | A kind of Vehicular charger merging DC-DC module |
| CN110138218A (en) * | 2019-06-25 | 2019-08-16 | 深圳市海浦蒙特科技有限公司 | A kind of band-type brake power supply of adjustable output voltage |
-
2010
- 2010-12-31 CN CN2010206959688U patent/CN202026240U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109698542A (en) * | 2019-01-11 | 2019-04-30 | 深圳市南瑞华腾新能源有限公司 | A kind of Vehicular charger merging DC-DC module |
| CN110138218A (en) * | 2019-06-25 | 2019-08-16 | 深圳市海浦蒙特科技有限公司 | A kind of band-type brake power supply of adjustable output voltage |
| CN110138218B (en) * | 2019-06-25 | 2020-08-11 | 深圳市海浦蒙特科技有限公司 | Band-type brake power supply with adjustable output voltage |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518051 Shenzhen Nanshan District, Guangdong Province, Guangdong Province, Yuehai Street High-tech Zone Community Science and Technology South Road 18 Shenzhen Bay Science and Technology Eco-Park 12 Skirt Building 732 Patentee after: Shenzhen Bojuxing Microelectronics Technology Co., Ltd. Address before: 518083 12 floors, Block C, Chuangwei Building, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Bojuxing Industrial Development Co., Ltd. |
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| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111102 |
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| CX01 | Expiry of patent term |